Telkom poor service

I have had over 5 contracts with telkom, from 2011 to date , whenever my cellphone contracts are finished and I place a cancellation request it is process on time , I have gone to the branch in Phoenix twice to place request to cancel my to existing contract which are still debating my account but nothing has been done , Iam just shocked how I keep been referred to call centers who say my request has been sumitted , but I keep getting calls to upgrade my contract whenever I call the center I get different story, Iam just sick and tired of the poor service I keep running after people when I am the customer, I suppose to upgrade my contract but not after such bad service, I called the call center to today and was told my I owe 1300 for a contract that was taken in 2012 , Iam jus shocked every contract I have taken was from the Phoenix branch and was cancelled without any problems , Telkom needs to get staff who actually process cancellation on time and have the proper knowledge of what there are doing , it's a shame as my dad who has a business also has experience the same problems , this needs to sorted out now one seems to care at Telkom , shocked and disgusted at the poor service